Using a credit card to invest is not currently permitted in the UK. It makes sense if you think about it – we would never advise investing with money that doesn't belong to you! Instead we only allow top-ups using your debit card.
CIRCA5000 accepts all UK based Mastercard Debit and Visa Debit cards.
Having problems with your card being accepted? Let our Customer Support team know by emailing firstname.lastname@example.org or using your in-app chat and we'll be happy to help!